21381780

素因数分解:

$2^2\times 3^1\times 5^1\times 7^1\times {\mathrm{50909}}^1$

素因数の和:50928

約数の個数: 48

約数和(自身を含む): 68423040

約数和(自身を除く): 47041260

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 105, 140, 210, 420, 50909, 101818, 152727, 203636, 254545, 305454, 356363, 509090, 610908, 712726, 763635, 1018180, 1069089, 1425452, 1527270, 1781815, 2138178, 3054540, 3563630, 4276356, 5345445, 7127260, 10690890, 21381780]

約数ペア:

[(1, 21381780), (2, 10690890), (3, 7127260), (4, 5345445), (5, 4276356), (6, 3563630), (7, 3054540), (10, 2138178), (12, 1781815), (14, 1527270), (15, 1425452), (20, 1069089), (21, 1018180), (28, 763635), (30, 712726), (35, 610908), (42, 509090), (60, 356363), (70, 305454), (84, 254545), (105, 203636), (140, 152727), (210, 101818), (420, 50909)]